Which device is NOT used to monitor response during neonatal resuscitation?

In the context of neonatal resuscitation, monitoring the response of the newborn is crucial for assessing their condition and the effectiveness of the resuscitation efforts. A thermometer is primarily used to measure body temperature, which, while important for overall care and management in a neonatal environment, is not directly involved in monitoring immediate responses to resuscitation techniques.

On the other hand, devices like a pulse oximeter, stethoscope, and electrocardiogram (ECG) are essential tools used during resuscitation. The pulse oximeter provides information about oxygen saturation in the blood, indicating how well the baby is oxygenating. The stethoscope allows for the assessment of heart rate and lung sounds, which are critical for evaluating the newborn's response to resuscitation. The ECG monitors the electrical activity of the heart, helping to detect any arrhythmias or changes in heart rate that may occur during resuscitation efforts.

Thus, while temperature monitoring is an important aspect of neonatal care, the thermometer does not serve the specific purpose of monitoring the immediate response during the resuscitation process, making it the device that is not used for this particular context.